Northstar rebuild: Will style (Page 78/119)
IXSLR8 MAY 05, 11:18 PM
Dang! I still have the random stall using the LS1 unit. I also have the high rpm start and then drop to 750. The HP Tuner didn't get the stall problem tuned out. So, what did your shop do? I have the mild 272 cams too, eh. I've seriously thought about going back to VIN 9 cams.

Why the Y2K intake manifold?

[This message has been edited by IXSLR8 (edited 05-05-2013).]

fieroguru MAY 06, 08:17 AM

quote
Originally posted by IXSLR8:
Dang! I still have the random stall using the LS1 unit. I also have the high rpm start and then drop to 750. The HP Tuner didn't get the stall problem tuned out. So, what did your shop do? I have the mild 272 cams too, eh. I've seriously thought about going back to VIN 9 cams.



Larger camshafts are less efficient at idle, so they need more airflow and less fuel to avoid stalling/surging. It sounds like you need to increase the Base Running Airflow values. With the right airflow values the engine RPMs will drop to idle RPM w/o stalling.
Will MAY 07, 09:50 AM
After some more driving time, I've found that it has the flared start when it's cold, but on hot restarts it barely exceeds idle.

Your cams definitely affect your idle tuning.
Not all tuners are created equal. If the tuner is good at getting cammed up LS1's to idle, he should be able to do it for you.

I have 288's on the shelf, so I'll be dealing with the same thing in a while.
Will MAY 17, 08:21 PM

quote
Originally posted by IXSLR8:

Why the Y2K intake manifold?




Bigger runners than the '93-'99 manifold to go along with the bigger intake ports on the roller cam heads. CHRF's numbers for ported flat tappet heads get to about 280 CFM on the intake; ported roller cam heads top 300.

I'm making an educated guess that the stock Y2K manifold will be pretty close to the right size/shape/location/angle to work with ported flat tappet heads. I'll probably end up doing a mock assembly without valves so that I can judge how close the manifold and ported heads will end up being... may have to spend quality time with a sanding roll to get the interface perfect.

[This message has been edited by Will (edited 05-17-2013).]

Will JUN 05, 10:40 AM
Proof the valve cover comes off with the engine in the car:



Blingin' new mad JDMTytej0 blue valve cover seal (plug well o-rings not installed):


This may have been the problem
This images is larger than 153600 bytes. Click to view.

Finally finished the CAI. It's been on the car a couple of weeks now, but the car's been at my dad waiting for some rust repair on the passenger floor pan. The really good welder is moving about 2 hours south of my dad's place (about 3-3.5 hours from where I live) and starting his own shop. Good luck to him, but that means now I have to start paying for welding (and learning how to do it myself). The guy at the fab shop I've had to use has already had some "interesting" interpretations of my directions for both the diff snout bracket on the Eagle project and repair of The Mule's right rear engine mount bracket.

The CAI can be installed without disconnecting shift cables or removing the shift linkage, but it's very tight and needs a little persuasion in order to squeeze between the bottom edge of the stock fenderwell pass-through and the fuel fill pipe. It's 3.5"... I'm not sure how Sinister got a 4" pipe through.

The induction noise is quite different. The old setup of a mitered stainless pipe with parts store paper filter in the engine bay sounded like a combined jam session with Metallica and Skrillex when I put the loud pedal down and ran out the RPM. Now it sounds more like a sporting V8. I was also surprised to find that I could tell a difference in the location of the source of the sound.

Without further ado, I give you the frankenstien caterpillar pornstar;



With BDSM accessories:


The old crappy setup:


The new hawttness:


Top view:


Across the bay angle:


It doesn't show up in any of the photos (I guess that was the idea--to keep it out of sight) but there is a bung for the IAT on the bottom of the tube right next to the coupler to the MAF housing. I re-routed the IAT wires from being bundled with the fuel pump and A/C clutch relays to being bundled with the TPS, IAC and MAF wires.

[This message has been edited by Will (edited 06-05-2013).]

Will AUG 05, 02:28 PM
Had some driveability problems that were partially fixed by replacing the coils and probably will be completely fixed by replacing the ignition switch.
Will OCT 21, 10:19 AM
Body side ground had deteriorated... new screw and some dielectric grease in it, and it works again.

The engine block grounds from the engine wiring harness had deteriorated a bit, too. I replaced both ground lugs/loops and they're doing ok again. Time for plugs...

Making headway with Torque in that I was able to load the predefined set of GM PID's, BUT I'm getting junk data for the injector pulse widths and misfire counters.
Will JAN 18, 09:31 PM
This happened a couple of weeks ago on my way back from the bank:





I eased out from a stoplight until the clutch was hooked up then punched it and had a free rev... I had enough momentum to make it to a parking lot. Came back later and brought it home on a rope. My dad was able to raid the stash and send me another tripod assembly.

The cup I broke at the dragstrip and this tripod were both in the car for the 1.5 years I daily drove it in P'Cola, so this is most likely the result of long term accumulation of overstress.

Also, finally got my heat shields done:







I'm not sure if the bolt that holds the two pieces together will clear the exhaust or not. If not, I'll replace it with a great big pop rivet or similar.

There's about 1/16" between the under-pan heat shield and the pan and about 1/16" between the heat shield and the pipe. I was testing it in the car before I decided I needed to make the rear face heat shield that would interface to it.

[This message has been edited by Will (edited 01-18-2014).]

Will JAN 21, 12:19 PM
Couple more shots of the heat shields:
fierogtlt1 JAN 21, 01:00 PM
Great job on the heat shields......They looks awesome.

[This message has been edited by fierogtlt1 (edited 01-21-2014).]